Sociodemographic characteristics
| A IDD-plus-SRAD N=4220 | B IDD-only N=62 264 | C SRAD-only N=96 589 | Cohen's d* (95% CI) | |||
|---|---|---|---|---|---|---|
| A vs B | A vs C | B vs C | ||||
| Age (%) | ||||||
| 18–24 years | 23.6 | 24.1 | 12.9 | −0.02 (−0.06 to 0.03) | 0.41 (0.36 to 0.45) | 0.41 (0.41 to 0.44) |
| 25–34 years | 22.6 | 20.0 | 20.2 | 0.09 (0.04 to 0.13) | 0.08 (0.04 to 0.12) | −0.01 (−0.02 to 0.01) |
| 35–44 years | 19.5 | 20.4 | 23.0 | −0.03 (−0.07 to 0.01) | −0.12 (−0.16 to −0.07) | −0.08 (−0.10 to −0.07) |
| 45–54 years | 23.2 | 22.3 | 27.8 | 0.03 (−0.01 to 0.07) | −0.13 (−0.17 to −0.09) | −0.16 (−0.18 to 0.15) |
| 55–64 years | 11.0 | 13.3 | 16.1 | −0.12 (−0.17 to 0.06) | −0.24 (−0.30 to −0.19) | −0.12 (−0.14 to −0.11) |
| Male (%) | 64.4 | 56.8 | 58.8 | 0.18 (0.14 to 0.21) | 0.13 (0.10 to 0.17) | −0.05 (−0.06 to −0.03) |
| Rural (%) | 13.4 | 15.9 | 13.4 | −0.11 (−0.16 to −0.06) | 0 (−0.05 to 0.05) | 0.11 (0.09 to 0.13) |
| Neighbourhood income quintile (%) | ||||||
| 1 (lowest) | 40.6 | 29.3 | 25.6 | 0.28 (0.24 to 0.31) | 0.38 (0.34 to 0.41) | 0.10 (0.09 to 0.12) |
| 2 | 22.3 | 21.3 | 21.2 | 0.03 (−0.01 to 0.07) | 0.04 (−0.01 to 0.08) | 0.00 (−0.01 to 0.02) |
| 3 | 14.9 | 17.6 | 19.0 | −0.11 (−0.16 to −0.06) | −0.16 (−0.21 to −0.11) | −0.05 (−0.07 to −0.04) |
| 4 | 11.2 | 16.3 | 17.9 | −0.24 (−0.29 to −0.18) | −0.30 (−0.36 to −0.25) | −0.06 (−0.08 to −0.05) |
| 5 (highest) | 9.5 | 14.2 | 15.1 | −0.25 (−0.31 to −0.19) | −0.29 (−0.35 to −0.23) | −0.04 (−0.06 to −0.02) |
*Cells with effect sizes ≥0.2 and 95% CIs which do not go below 0.2 are in bold.
IDD, intellectual and developmental disabilities; SRAD, substance-related and addictive disorders.